As long as you doing nothing wrong (no overstay etc.) You can enter by plane multiple times.
I come to Thailand 🇹🇠more than 30 years now.
Im working offshore 4-6 weeks, than enter always by normal tourist visa (30days) sometimes, depending on my work, I extend another 30 days at the local immigration.
Im every year 4-6 times in Thailand for normal leisure reasons.
I never ever get any problems at immigration.
Even I stayed in Thailand during the lockdown for over a year with the covid visas. Never got any problems at all
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